胡洪飞;王芳;臧进前;刘锋;车延安;

• 1:河北地质大学
• 2:山东省物化探勘查院
• 3:河北省地矿局第四地质大队

摘要(Abstract)：

首次对内蒙古伊敏地区黑云母二长花岗岩进行了锆石U-Pb年代学和地球化学研究。分析结果显示,该区黑云母二长花岗岩具有高硅(w(SiO_2)=68.32%～70.62%),富碱(w(Na_2O+K_2O)=7.79%～9.01%),贫CaO(0.89%～2.51%)、MgO(0.80%～1.30%)、P_2O_5(0.16%～0.23%)的地球化学特征。A/CNK和A/NK值分别介于0.99～1.08和1.22～1.42之间,属于准铝质-过铝质钙碱性系列。岩石稀土元素总量较低,轻重稀土元素分馏明显(∑LREE/∑HREE=13.35～16.19),无明显Eu、Ce异常,富集K、Rb、Th、Ba、Sr和LREE,相对亏损U、Ti、La、Ce,综合分析认为黑云母二长花岗岩具有Ⅰ型花岗岩的地球化学特征。锆石LA-ICP-MS U-Pb测年结果表明,其形成于(303±2)Ma,为晚石炭世岩浆活动产物。Hf同位素数据显示,其具有高的_(εHf)(t)值(+9.20～+15.89),对应二阶段模式年龄(T_(DM2))集中分布于700～500 Ma之间,反映黑云母二长花岗岩起源于新元古代增生的地壳,形成于兴安地块和松嫩地块碰撞后的伸展背景。

关键词(KeyWords)： 黑云母二长花岗岩;锆石U-Pb年代学;晚石炭世;地球化学;伊敏地区

Abstract:

Keywords:

基金项目(Foundation): 河北省教育厅青年基金项目(QN2018097);; 河北地质大学博士启动基金项目(BQ2017051);; 内蒙古自治区地质勘查基金项目(NMKD2013-7)

作者(Author): 胡洪飞;王芳;臧进前;刘锋;车延安;

Email:

DOI: 10.19509/j.cnki.dzkq.2018.0501

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